Vast differences in cycling cultures have been found in UK cities; for some cycling is a traditional transport accessible to all while for others it is a new edgy, urban subculture according to recent findings from a research project funded by the Economic and Social Research Council (ESRC).

Chalcocite, copper(I) sulfide (Cu2S), is an important copper mineral ore. It is opaque, being colored dark-gray to black with a metallic luster. It has a hardness of 2Â½ - 3. It is a sulfide with an orthorhombic crystal system.
Chalcocite is sometimes found as a primary vein mineral in hydrothermal veins. However, most chalcocite occurs in the supergene enriched environment below the oxidation zone of copper deposits as a result of the leaching of copper from the oxidized minerals. It is...